Create central space option for `discourse_map` and accompanying `Animate` method.

[trinker]

Create central space option for discourse_map and accompanying Animate method.

The discourse travels to a central space before being uptaken by other social actors. The social space would be for times when one group is conversing at once and discourse is passed into a central space. A circular configuration with a central space node may be more sensible for this and places emphasis on equality of actors.

[trinker]

Read up on 3rd space as this is likely what the shared space is. Gee.